After updating one of All About Symbian's E72's, there weren't many visible differences, certainly not as many as listed at the published change log that everyone has been quoting. We did notice a smaller font on the clock along the lower status bar of the E72's user interface.
The update is available over-the-air, but curiously not yet via Nokia Software Updater. For those who don't know how to trigger OTA updates, type in *#0000# from the home screen and select 'Check for updates' from the Options menu.
The E72 supports user data preservation (UDP), but as always, do make sure your data is backed up before performing any updates.